Two Mist Modes&Light ModesThe portable mini humidifier has two mist modes. Press the button once to continuously spray for 10 hours, and press the button twice to intermittently spray for 16 hours (stop for 2s).Long press the button for the first time to turn on the LED night light; Press the button a second time to switch the LED night light to the breathing light. You can choose the mode according to your needs.Very easy to operate and great help in moisturizing the dry air for longer time. Ultrasonic Quite Operation&The Best Choice- Less than 30 dB quiet atmosphere can create a quieter sleeping environment. Humidify your living space to prevent dry, stuffy air and flu/cold germs infecting your loved ones.the whisper quiet humidifiers purifier provide fresh and clean air,moisturize the dry skin, improve skin dry peeling. It can keeps your living space clean and properly moisturized,you can enjoy moisturize environment leisurely,Ideal for bedroom, living room, office, spa, Yoga. Powered by USB 500ml Large Capacity & Waterless Auto-Off- The air humidifier diffuser with tank capacity is 500ml, up to 10-16 hours working time. The cool mist humidifiers can only be powered by USB cable. No AC Adapter in box. The USB cable is included, interface of computer, laptop, power bank.When the water level of the water tank is lower than the water level probe in the water tank, all spray modes will be automatically turned off.dry burning prevention ensures use safety to you. NoteDo not use essential oils,perfume, distilled water, which will cause the cotton swab to clog and the humidifier to be unusable. If the humidifier can not spray when you use it at first time, please add full water then put it upside down in 5 minutes to let it faster absorb enough water or soak the cotton. Best service: we strive to provide you with quality products.